Because of the rise of the consumption tax from 5 to 8% enacted by the Japanese Government on April 1st, the Japan Post Office had to issue a whole set of new stamps, regular and others, to make it easier for people to buy their stamps according to the new postal fees.
Likewise the government is using (wisely for once) the occasion to advertise gastronomy.

The 5th Fruitｓ & Vegetables Series comes in two sheets of sticker stamps, one for 52 yen stamps for postcards and the one for 82 yen stamps for basic letters!

For the 82 yen stamps sheet, broccoli, Unshuumikan/citrus unshu, a variety of tangerine which has many other English names, horensou/spinach, kiwi, hakusai/Chinese cabbage and more mikan/mandarin oranges for thr design background!